220 lines
7.2 KiB
JavaScript
220 lines
7.2 KiB
JavaScript
#!/usr/bin/env node
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// node bin/debug.js ../dig.js/blar.DOEsNteXiST.AJ.OnEal.DAplIE.me.any.0.bin
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// node bin/debugd.js ../dig.js/blar.DOEsNteXiST.AJ.OnEal.DAplIE.me.any.0.bin
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// dig @localhost -p 65053 ANY DOEsNteXiST.AJ.OnEal.DAplIE.me
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// dd if=../dig.js/blar.DOEsNteXiST.AJ.OnEal.DAplIE.me.any.0.bin of=blar.DOEsNteXiST.AJ.OnEal.DAplIE.me.any.0.trunc.bin bs=1 count=78
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(function () {
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'use strict';
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var input = process.argv[2];
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var fs = require('fs');
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var nb = fs.readFileSync(input, null);
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var ab = nb.buffer.slice(nb.byteOffset, nb.byteOffset + nb.byteLength);
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var dv = new DataView(ab);
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//
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// read header
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//
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console.log('');
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console.log('//////////////////');
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console.log('// HEADER //');
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console.log('//////////////////');
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console.log('');
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console.log('');
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console.log('byte index 0x00');
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console.log('');
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console.log('id (int)', dv.getUint16(0));
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var flags = dv.getUint16(2, false);
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console.log('header 0x', flags.toString(16));
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var flagsstr = ''
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+ 'qr ' + ((flags & 0x8000) >> 15) + ', '
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+ 'opcode ' + ((flags & 0x7800) >> 11) + ', '
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+ 'aa ' + ((flags & 0x400) >> 10) + ', '
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+ 'tc ' + ((flags & 0x200) >> 9) + ', '
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+ 'rd ' + ((flags & 0x100) >> 8) + ', '
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+ 'ra ' + ((flags & 0x80) >> 7) + ', '
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+ 'res1 ' + ((flags & 0x40) >> 6) + ', '
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+ 'res2 ' + ((flags & 0x20) >> 5) + ', '
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+ 'res3 ' + ((flags & 0x10) >> 4) + ', '
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+ 'rcode ' + ((flags & 0xF));
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console.log('(flags: ' + flagsstr);
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var qdcount = dv.getUint16(4, false); // query count
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var ancount = dv.getUint16(6, false); // answer count
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var nscount = dv.getUint16(8, false); // authority count
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var arcount = dv.getUint16(10, false); // additional count
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var count;
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console.log('qdcount', qdcount);
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console.log('ancount', ancount);
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console.log('nscount', nscount);
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console.log('arcount', arcount);
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function unpackQuestionLabels(opts) {
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var dv = opts.dv;
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//var origTotal = opts.total;
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var total = opts.total;
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var len = opts.len;
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var qnames = [];
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var labelLen;
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while (true) {
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if (total >= len) {
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opts.trunc = true;
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console.warn('');
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console.warn('[WARNING] The label was truncated by byte length of message or rdata.');
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console.warn('[WARNING] Depending on the Resource Record type, that may be a parse error.');
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console.warn('');
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break;
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}
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labelLen = dv.getUint8(total, false); // additional count
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total += 1;
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if (!labelLen) {
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break;
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}
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if (labelLen >= 0xc0) {
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// (11 000000 & whatever) signifies pointer
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// (00 111111 & whatever) bitmask for potentially large pointer
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// (00 000001 11111111) largest realistic pointer value (512 byte message size)
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var pointer = ((labelLen & 0x3f) << 8) | dv.getUint8(total, false);
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console.log('Found a pointer to'
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+ ' 0x' + pointer.toString(16) + ' (' + pointer + ')'
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+ ' at byte index'
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+ ' 0x' + leftPad(total.toString(16)) + ' (' + total + ')'
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//+ ' which back-references:'
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);
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/*
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console.log('-4', dv.getUint8(pointer - 4, false));
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console.log('-3', dv.getUint8(pointer - 3, false));
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console.log('-2', dv.getUint8(pointer - 2, false));
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console.log('-1', dv.getUint8(pointer - 1, false));
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console.log(' 0', dv.getUint8(pointer + 0, false));
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console.log('+1', dv.getUint8(pointer + 1, false));
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console.log('+2', dv.getUint8(pointer + 2, false));
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console.log('bytes near the pointer itself (not what it points to) are:');
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console.log('-2', dv.getUint8(total - 2, false));
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console.log('-1', dv.getUint8(total - 1, false));
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console.log(' 0', dv.getUint8(total + 0, false));
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console.log('+1', dv.getUint8(total + 1, false));
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console.log('+2', dv.getUint8(total + 2, false));
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console.log('+3', dv.getUint8(total + 3, false));
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console.log('+4', dv.getUint8(total + 4, false));
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*/
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//total += 1;
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opts.cp = true;
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qnames.push(unpackQuestionLabels({ dv: dv, total: pointer, len: len }).qname);
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total += 1;
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break;
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} else {
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var i;
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var label = '';
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console.log('label len', labelLen);
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for (i = 0; i < labelLen; i += 1) {
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//console.log('total:', total, i);
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label += String.fromCharCode(dv.getUint8(total + i, false));
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}
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total += label.length;
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console.log('label:', label);
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qnames.push(label);
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}
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}
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return {
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total: total
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, qname: qnames.join('.')
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};
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}
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function unpackQuestion(dv, total, len) {
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var result = unpackQuestionLabels({ dv: dv, total: total, len: len });
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// leading length and (potentially) trailing null
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console.log('QNAME (len ' + (result.total - total) + '):', result.qname, result.cp ? '(pointer)' : '');
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console.log('QTYPE (len 2):', dv.getUint16(result.total, false));
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result.total += 2;
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console.log('QCLASS (len 2):', dv.getUint16(result.total, false));
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result.total += 2;
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return result;
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}
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var q = { total: 12 };
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function mapChar(ch) { return JSON.stringify(String.fromCharCode(ch)) + '(' + ch + ')'; }
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function leftPad(ch) { ch = ch.toString(); while (ch.length < 2) { ch = '0' + ch; } return ch; }
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console.log('');
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console.log('//////////////////');
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console.log('// QUESTION //');
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console.log('//////////////////');
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console.log('');
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for (count = 0; count < qdcount; count += 1) {
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console.log('');
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console.log('Question ' + (count + 1) + ' of ' + qdcount + ' (byte index: 0x' + leftPad(q.total.toString(16)) + ' ' + q.total + ')');
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q = unpackQuestion(dv, q.total, ab.byteLength);
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console.log('');
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}
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function unpackResourceRecord(dv, q, ab) {
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var _q = unpackQuestion(dv, q.total, ab.byteLength);
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q.total = _q.total;
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console.log('ttl (len 4):', dv.getUint32(q.total, false));
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q.total += 4;
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q.rdlength = dv.getUint16(q.total, false);
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console.log('rdlen (len 2):', q.rdlength);
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q.total += 2;
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console.log('rrdata (len ' + q.rdlength + '):');
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console.log([].slice.call(new Uint8Array(ab), q.total, q.total + q.rdlength).map(mapChar).join(' '));
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q.total += q.rdlength;
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console.log('');
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}
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console.log('');
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console.log('//////////////////');
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console.log('// ANSWER //');
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console.log('//////////////////');
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console.log('');
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for (count = 0; count < ancount; count += 1) {
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console.log('');
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console.log('Answer', count + 1, 'of', ancount + ' (byte index: 0x' + q.total.toString(16) + ' ' + q.total + ')');
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unpackResourceRecord(dv, q, ab);
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console.log('');
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}
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console.log('');
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console.log('//////////////////');
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console.log('// AUTHORITY //');
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console.log('//////////////////');
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console.log('');
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for (count = 0; count < nscount; count += 1) {
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console.log('');
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console.log('Authority', count + 1, 'of', nscount + ' (byte index: 0x' + q.total.toString(16) + ' ' + q.total + ')');
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unpackResourceRecord(dv, q, ab);
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console.log('');
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}
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console.log('');
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console.log('//////////////////');
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console.log('// ADDITIONAL //');
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console.log('//////////////////');
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console.log('');
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for (count = 0; count < arcount; count += 1) {
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console.log('');
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console.log('Additional', count + 1, 'of', arcount + ' (byte index: 0x' + q.total.toString(16) + ' ' + q.total + ')');
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unpackResourceRecord(dv, q, ab);
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console.log('');
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}
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console.log('');
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console.log('total bytes', dv.byteLength);
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console.log('total bytes read', q.total);
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console.log('');
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}());
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